Soil carbon mineralization by priming effect: Temperature sensitivity mechanism of soil carbon mineralization

• Project/Area Number: 17K00524
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Environmental dynamic analysis
• Research Institution: The University of Shiga Prefecture
• Principal Investigator: IIMURA YASUO 滋賀県立大学, 環境科学部, 講師 (80599093)
• Co-Investigator(Kenkyū-buntansha): 泉津 弘佑 滋賀県立大学, 環境科学部, 講師 (20579263) ; 藤嶽 暢英 神戸大学, 農学研究科, 教授 (50243332)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2017: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 温暖化 / 土壌 / 炭素 / プライミング効果 / 炭素安定同位体比 / 土壌微生物 / 土壌炭素 / 窒素沈着 / 地球温暖化 / 化学構造 / 微生物

Outline of Final Research Achievements

The response of soil organic carbon (SOC) to global warming is a crucial subject. Changes in the mineralization of native SOC, i.e., priming effect” (PE) may strongly affect the temperature sensitivity of SOC turnover in the presence of global warming. We investigated the temperature sensitivity of SOC in a Japanese volcanic ash soil considering PE phenomenon. We found that soil-originated CO2 emission clearly increased with increasing temperature on the assumption that the temperature and substrate supply increase at the same time. These results suggest that not only the temperature increase but also the labile carbon supply may be important for the temperature sensitivity of Japanese volcanic ash soil.

Academic Significance and Societal Importance of the Research Achievements

土壌は陸域最大の炭素貯蔵庫であるため、温暖化の進行にともなう土壌炭素の分解量の増減は温暖化の行方にも大きな影響を及ぼす可能性がある。そのため、土壌炭素の温暖化応答を理解することは重要な研究課題となっている。本研究では温暖化に伴って土壌への影響が強くなり得る植物由来の炭素供給に着目しこれらの影響に伴う土壌炭素分解量の変化を考慮した温暖化応答を評価した。その結果、植物の影響評価の有無によって温暖化に伴う土壌炭素分解量は大きく変化する可能性を見出した。これらの成果は今後の温暖化に伴う土壌応答予測にとっても重要な知見になり得る。

Research Products

• [Journal Article] 冷温帯落葉広葉樹林における林床ササ群落（Sasa senansis）の有無が火山灰土壌の窒素無機化に及ぼす影響 (2019)
  • Author(s): 飯村康夫・森田悠介・大塚俊之
  • Journal Title: 日本土壌肥料学雑誌 Volume: 90 Pages: 381-385
  • Peer Reviewed
• [Journal Article] 大白川ブナ・ミズナラ成熟林（old-growth forest）における土壌窒素無機化速度の空間変動解析 (2019)
  • Author(s): 飯村康夫・Vilanee Suchewaboripont・廣田充・吉竹晋平・大塚俊之
  • Journal Title: 日本土壌肥料学雑誌 Volume: 90 Pages: 415-423
  • NAID: 130007762547
  • Peer Reviewed
• [Journal Article] Soil carbon stocks and their primary origin at mature mangrove ecosystems in the estuary of Fukido River, Ishigaki Island, southwestern Japan (2019)
  • Author(s): Iimura Y, Kinjo K, Kondo M, Ohtsuka T
  • Journal Title: Soil Science and Plant Nutrition Volume: 65 Issue: 5 Pages: 435-443
  • DOI: 10.1080/00380768.2019.1660589
  • NAID: 210000157104
  • Peer Reviewed
• [Journal Article] Priming effect of the addition of maize to a Japanese volcanic ash soil and its temperature sensitivity (2019)
  • Author(s): Iimura Y, Tabara I, Izumitsu K, Fujitake N
  • Journal Title: Soil Science and Plant Nutrition Volume: 65 Issue: 5 Pages: 444-450
  • DOI: 10.1080/00380768.2019.1665969
  • Peer Reviewed
• [Journal Article] Priming effect of Miscanthus sinensis derived biochar on brown forest soil. (2019)
  • Author(s): Iimura, Y., Natsuhara, M., Ohtsuka, T., Tomotsune, M., Yoshitake、S., Koizumi, H.
  • Journal Title: Soil chemistry and soil mineralogy Volume: 65 Issue: 6 Pages: 550-556
  • DOI: 10.1080/00380768.2019.1672101
  • NAID: 210000157215
  • Peer Reviewed
• [Presentation] 火山灰土壌におけるプライミング効果の温度依存性 (2019)
  • Author(s): 飯村康夫・田原一聖・泉津弘佑・藤嶽愓英
  • Organizer: 日本土壌肥料学会
• [Presentation] バイオチャー の添加に伴う土壌有機物分解速度変化 (2018)
  • Author(s): 飯村康夫・夏原政明
  • Organizer: 日本腐植物質学会
• [Presentation] 土壌深層でのプライミング効果：セルロース添加に伴う火山灰土壌層の応答を例に (2017)
  • Author(s): 飯村康夫・小林美春
  • Organizer: 日本土壌肥料学会